My meteorites: Campo del Cielo (40g)

April 25, 2018

My recent talk on impacts and the end-Cretaceous extinctions reminded me that I’ve never posted about my meteorite collection. It’s not a large collection, just a handful of things I’ve picked up, but each is satisfying in its own way.

This is the first meteorite I ever owned, a 40g piece of Campo del Cielo from Argentina. It’s about the size of the last joint of your index finger. Following the universal standard for meteorite photography, the scale cube in the photos is 1cm.

I picked this up probably 15 years ago at an auction at a Society of Vertebrate Paleontology annual meeting. I don’t remember the year – early 2000s for sure. The meteorite came with a little drawstring bag made of red felt, and a certificate of authenticity. It was clearly marked as a chunk of Campo del Cielo, which fell over northwest Argentina four or five thousand years ago.

The original Campo del Cielo meteor exploded in the atmosphere, much like the Chelyabinsk meteor over Russia in 2013, but on a much grander scale. The Chelyabinsk meteor is estimated to have been 20m in diameter, and it produced an airburst of approximately 500 kilotons. The Campo del Cielo meteor was probably more like 50m in diameter, so it would have been a multi-megaton explosion in the upper atmosphere. The resulting strewn field is 2 miles wide, more than 11 miles long, and includes at least 26 craters with diameters of up to 100 meters; the impact of the fragment that produced the 100-meter crater would itself have been multi-kiloton event.

I didn’t know any of that at the time I got the meteorite at the auction. I vividly remember how much I paid for it: $80. I remember so clearly because I almost instantly regretted it. I don’t know who I was talking to afterward, but someone looked at the meteorite and commented that it would be easy to fake with a bit of iron slag. That seemed plausible – it didn’t look like any meteorite I’d seen pictures of, so I assumed the chance that it was a fake was high. I had other fish to fry at the time, being a new dad and halfway through a dissertation, so I never did any research to see if the meteorite was real or fake. I kept it, but I never put it on display, and over the years I sort of lost track of it.

I rediscovered it this January during a major bout of house-cleaning. It’s funny, in the time between when I obtained this piece and now, I’ve looked at so many meteorite photos that I can just glance at this and think, “Yep, it’s a Campo”. Five minutes of image searching for Campo del Cielo pieces will turn up many authenticated examples with the same general appearance, like angular chewed gum with fracture lines and surface pitting. Campo del Cielo is one of the least expensive meteorites to obtain, with prices around $1/gram still being pretty common. (So in fact I overpaid a bit back when I got this, but since it was an auction to support the society I don’t mind.) With such distinctive morphology and such low prices, it’s probably much less expensive to simply buy a real piece of Campo than to fake one, especially at small sizes.

So even though it is one of the smallest pieces in my collection, this little gem means a lot to me. It tells two stories: one about my personal journey from interested-but-ignorant space enthusiast to semi-knowledgeable, semi-professional astronomy writer – and one about a 65,000-ton chunk of iron from the core of a shattered planetoid, which exploded with the force of an entire nuclear arsenal and showered a vast area with what must have been a lethal rain of shrapnel, from pea-sized up to house-sized. Including this little piece, cosmic voyager and witness to awesome forces of creation and destruction.

– – – – – – – – – – – – – – –

If you’re interested in obtaining a meteorite or starting a collection, I have two pieces of advice. The first is, buy from reputable dealers. Many honest dealers are members of the International Meteorite Collections Association and will list their IMCA member number wherever they do business. There are good dealers who are not IMCA members for various reasons – some just don’t like clubs and the politics that sometimes comes along with membership – but it’s a start. Also check seller feedback if you buy from online markets like eBay. And use search tools to do quick checks on individual dealers; the meteorite collecting community is pretty vigilant about detecting and outing bad actors.

The second and probably more important guideline is to educate yourself. Spend a week of evenings looking through websites and online ads and learning to know what to look for in genuine meteors. It’s not completely foolproof – a few unscrupulous people will pick up bits of inexpensive recent falls and try to pass them off as examples of rare and valuable historical meteorites, for example – but at least you’ll develop the knowledge to tell genuine meteorites from “meteorwrongs”. Good hunting!



  1. […] the photo book shown here with my meteorites. In the time since I blogged here about my pieces of Campo del Cielo and Sikhote-Alin I’ve obtained additional, smaller representatives of both falls. The NWA […]

  2. […] Campo del Cielo (40g) […]

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